Probiotic Bacteria Synthesis of Silver Nanoparticles
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Solution Overview
Problem
Conventional methods for producing silver or gold nanoparticles are costly, generate significant by-products, require high temperatures, acidic pH, or result in insufficient bactericidal activity, and lack environmental friendliness and reproducibility.
Innovation Solution
Using probiotic Lactobacillus bacteria to reduce silver or gold salts into colloidal nanoparticles under controlled pH conditions, allowing for the production of biologically stabilized nanosilver or nanogold with enhanced antimicrobial properties, which can be easily harvested and processed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional methods are used to produce silver nanoparticles, then nanoparticle production is achieved, but production costs are high and significant by-products are generated
Solution Approach 1:
The patent converts the harmful effect of silver ion toxicity toward eukaryotic cells into a beneficial selective toxicity toward microorganisms. By using probiotic bacteria to bioreduce silver ions to nanoparticles, the process achieves high antimicrobial activity while avoiding the need for toxic chemical by-products, thus transforming a potential harm into a benefit.
Solution Approach 2:
The patent employs probiotic bacteria that naturally possess reducing ability to convert silver ions to nanoparticles. The bacteria use their own metabolic capabilities (self-service) to perform the reduction, eliminating the need for external chemical reducing agents and their associated by-products, thereby reducing both production cost and harmful substance generation.
2Productivity
If high temperature and acidic pH conditions are used, then nanoparticle production is enhanced, but environmental friendliness is compromised
Solution Approach 1:
The patent changes the operational parameters from harsh conditions (high temperature, acidic pH) to mild physiological conditions (neutral pH, ambient temperature). The probiotic bacteria perform silver ion reduction under these gentle conditions, maintaining high productivity while eliminating environmental harm associated with extreme parameter values.
Solution Approach 2:
The probiotic bacteria utilize their natural metabolic functions to perform silver ion reduction under physiological conditions. This self-service approach allows the system to operate at optimal bacterial growth conditions rather than requiring external harsh conditions, thus achieving efficiency without environmental harm.
3Reliability
If conventional silver nanoparticle production methods are used, then bactericidal activity is achieved, but the method is not scalable and lacks reproducibility
Solution Approach 1:
The patent uses probiotic bacteria with inherent reducing capabilities to produce silver nanoparticles. This self-service mechanism provides reliable and reproducible results because the bacteria's metabolic pathways are well-understood and consistent, enabling easy scaling from laboratory to industrial production while maintaining high bactericidal activity.
Solution Approach 2:
The probiotic bacteria serve multiple functions: they act as reducing agents, provide biological stabilization of nanoparticles, and maintain cell membrane integrity. This multi-functionality simplifies the process and enhances scalability, as the same biological system performs multiple roles that would otherwise require separate components, thereby improving reliability and reproducibility.
4Reliability
If probiotic Lactobacillus bacteria are used to reduce silver salts, then antimicrobial activity is enhanced, but production time increases
Solution Approach 1:
The patent employs probiotic bacteria that continuously reduce silver ions to nanoparticles during their metabolic growth phase. This continuous action, driven by the bacteria's natural metabolism, maintains high antimicrobial activity while the production time is synchronized with the bacteria's growth cycle, preventing excessive time loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces nanoparticles with high antimicrobial activity at low concentrations, is cost-efficient, environmentally friendly, and scalable, with controlled particle size and distribution, effectively disinfecting surfaces and water without harming eukaryotic organisms.
Implementation Method 1
Using probiotic Lactobacillus bacteria to reduce silver or gold salts into colloidal nanoparticles
Implementation Method 2
production of biologically stabilized nanosilver or nanogold with enhanced antimicrobial properties
Data Source
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AI summary
This invention provides a method for producing a composition comprising colloidal nanoparticles of metals including silver, gold, zinc, mercury, copper, palladium, platinum, or bismuth, by contacting a metal or metal compound with bacteria. An embodiment of the method comprises a step of incubating probiotic bacteria with an aqueous solution comprising at least 4 mM of a silver or gold salt. A resulting nanosilver-containing composition is useful as a highly efficient antimicrobial agent, for instance when impregnated onto a carrier, or an algicide agent or a herbicide agent.